WO1999008906A1 - Device for letting pressurised gas stream into a safety device - Google Patents

Device for letting pressurised gas stream into a safety device Download PDF

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Publication number
WO1999008906A1
WO1999008906A1 PCT/EP1998/005153 EP9805153W WO9908906A1 WO 1999008906 A1 WO1999008906 A1 WO 1999008906A1 EP 9805153 W EP9805153 W EP 9805153W WO 9908906 A1 WO9908906 A1 WO 9908906A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
gas
support device
opening
pyrotechnic propellant
Prior art date
Application number
PCT/EP1998/005153
Other languages
German (de)
French (fr)
Other versions
WO1999008906A9 (en
Inventor
Mats Bohman
Peter Qvint
Original Assignee
Autoflator Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autoflator Ab filed Critical Autoflator Ab
Priority to US09/485,569 priority Critical patent/US6237951B1/en
Priority to DE19881140T priority patent/DE19881140B4/en
Publication of WO1999008906A1 publication Critical patent/WO1999008906A1/en
Publication of WO1999008906A9 publication Critical patent/WO1999008906A9/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/268—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous release of stored pressurised gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
    • F16K13/04—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member
    • F16K13/06—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member constructed to be ruptured by an explosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means

Definitions

  • the invention relates to a device for allowing gas under pressure to flow into a safety device, for example an airbag or a belt tensioner, according to the preamble of patent claim 1.
  • such devices have a pressure container for compressible gas with at least one opening which is closed with a gas-tight film cover, the film cover being supported over at least a large part of its free area by a support device which can be destroyed or retracted in a targeted manner after activation.
  • a support device which can be destroyed or retracted in a targeted manner after activation.
  • the object of the invention is therefore to develop the generic device in such a way that after actuation of the device to allow the pressurized gas to flow in, it is ensured that the gas-tight film which closes the pressure vessel is inevitably opened.
  • the device has a device which pierces the film immediately after the device is actuated, but before the time at which the support device moves. This also ensures that in the event that a collapsing support device after ignition is used, it is ensured that the sealing film is forcibly opened.
  • the device advantageously has a pyrotechnic propellant charge which is ignited after activation. It is particularly advantageous if the pyrotechnic propellant first causes the gas-tight film to pierce after it has been ignited and then moves it away from the support device.
  • the support device advantageously has an opening below the gas-tight film supported by it, which is approximately 20% of the area of the entire gas-tight film.
  • a nail can be driven through this opening via the expanding combustion gas of the pyrotechnic propellant in order to forcibly pierce the film.
  • the nail can advantageously be pivoted to the support device.
  • the film can also be burned by the expanding combustion gas of the pyrotechnic propellant charge, which reaches the gas-tight film directly through the opening in the support device.
  • the support device is designed such that it collapses after the pyrotechnic propellant has been ignited.
  • FIG. 1 shows a longitudinal section through a device according to the invention according to a first embodiment
  • FIGS. 1 and 6 a second embodiment of the invention in a representation according to FIGS. 1 and
  • a device for allowing gas under pressure to flow into an airbag not shown here, is shown.
  • a pressure vessel 14 for receiving a compressible gas is welded to a housing 12.
  • the compressible gas has a pressure of 200 bar, for example.
  • a pyrotechnic propellant charge 16 is arranged in the lower part of the housing 12 and can be ignited in a known manner after activation by a corresponding sensor.
  • the pressure vessel 14 has an opening 18 towards the housing 12. This is closed in a manner known for example from DE 195 40 618 A1 by means of a gas-tight film 20. So that the gas-tight film is not destroyed due to the high pressure of the gas compressed in the gas container 14, it is supported by a destructible or retractable support device 22.
  • Outlet openings 24 and nets 26 arranged in front of them are also provided in the housing 12 in a manner known from the prior art.
  • the compressed gas for inflating the airbag can flow through the outlet openings 24.
  • an opening 28 is provided on the destructible or retractable support device 22, which otherwise corresponds to that from DE 195 40 618 A1.
  • This opening 28 lies below the gas-tight film 20, which is covered and supported by the support device 22 in order to prevent unwanted destruction of the film, the area of the unsupported area of the film 20 created by the opening 28 is significantly smaller than the total area of the gas-tight film Slide 20 in total.
  • a nail 30 is pivotably arranged on the support 22 below the opening 28 and the film 20 resting thereon. This is arranged, for example, on a small plate 32 which is connected at one edge to the support device 22, for example via a film hinge, so that it can perform a pivoting movement.
  • a breakable limiting edge 34 is additionally arranged on the plate 32 carrying the nail 30, which delimits the plate 32 in the inclined position shown in FIG. 1 Fixed location.
  • 2 shows the state of the device at the time of triggering.
  • the nail 30 is still in its starting position.
  • the pyrotechnic propellant 16 is ignited so that the spontaneous evolution of the combustion gas of the propellant flows out through a correspondingly provided opening 36 in the direction of the plate 32.
  • the breakable boundary edge 34 is broken away, so that due to the developing gas pressure, the plate 32 is pivoted about its pivoting edge and the nail 30 passes through the opening 28 and the gas-tight film 20, so that the gas-tight film 20 surely pierces becomes.
  • Fig. 3 shows the state of the device at the time of triggering.
  • the nail 30 is still in its starting position.
  • the pyrotechnic propellant 16 is ignited so that the spontaneous evolution of the combustion gas of the propellant flows out through a correspondingly provided opening 36 in the direction of the plate 32.
  • the breakable boundary edge 34 is broken away, so that due to the developing gas pressure, the plate 32 is pivoted about its pivoting edge and the
  • the support device 22 Due to the pressure that continues to build up due to the ignition of the pyrotechnic propellant charge 16, the support device 22 is shifted laterally, as indicated by the arrow direction a in FIG. 4. Finally, the support device collapses laterally and completely opens the opening 18, so that the forcibly pierced gas-tight film 20 is completely moved out of the opening 18 by the escaping gas due to the lack of a supporting force. This final state is shown in FIG. 5.
  • FIG. 6 corresponds essentially to that according to FIG. 1, so that the same parts have been identified with the same reference numerals.
  • no nail is pivotably mounted below the opening 28 of the support device 22. Only the opening 28 below the gas-tight film 20 is left open here.
  • FIGS. 7 to 9 corresponds to the side view according to FIG. 2 according to the first embodiment of the invention.
  • the propellant 16 is just ignited and the combustion gases exit through the opening 36.
  • the film is 20 still sealed gastight.
  • the gas of the pyrotechnic propellant has spread and has reached the surface of the gas-tight film 20 through the opening 28.
  • the gas of the pyrotechnic propellant charge burned the film at the contact surface, so that it was pierced due to the burning in the area of the opening 28.
  • the support device 22 has been moved to the side at a time shortly thereafter due to the pressure building up after ignition of the pyrotechnic propellant charge, so that it collapsed due to the lack of support.
  • the opening 18 has been opened and the gas-tight film 20 which has been forcibly opened has been completely blown out of the opening by the gas.
  • the pressurized gas can thus flow freely out of the openings 24 into the airbag, not shown here.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Bags (AREA)

Abstract

The invention relates to a device for letting pressurised gas stream into a safety device such as an airbag or a belt tightener, comprising a pressurised container (14) for compressible gas with at least one opening (18). Said opening is sealed with a gas-tight film cover (20). At least a large part of the free surface of said film cover (20) is evenly supported by a support device (22). Said support device (22) can be specifically destroyed or retracted when the safety device is triggered. In order to ensure that the gas-tight film (20) opens systematically when the device is triggered, a device which penetrates or pierces the film (20) directly after the device is triggered but before the support device (229) moves is provided.

Description

Vorrichtung zum Einströmenlassen von unter Druck stehendem Gas in eine Device for inflowing gas under pressure into a
SicherheitsvorrichtungSafety device
Die Erfindung betrifft eine Vorrichtung zum Einströmenlassen von unter Druck stehendem Gas in eine Sicherheitsvorrichtung, beispielsweise einen Airbag oder einen Gurtstrammer nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for allowing gas under pressure to flow into a safety device, for example an airbag or a belt tensioner, according to the preamble of patent claim 1.
Derartige Vorrichtungen weisen nach dem Stand der Technik einen Druckbehälter für komprimierbares Gas mit mindestens einer Öffnung auf, die mit einer gasdichten Folienabdeckung verschlossen ist, wobei die Folienabdeckung über zumindest einen Großteil ihrer freien Fläche flächig durch eine gezielt nach Ansteuern zerstörbare oder einziehbare Abstützeinrichtung abgestützt ist. Aus der DE 195 40 618 A ist bereits ein derartiger Mechanismus bekannt, bei dem die gasdichte Folienabdichtung geöffnet wird, sobald die Abstützeinrichtung nach Ansteuern der Vorrichtung wegbewegt wurde.According to the prior art, such devices have a pressure container for compressible gas with at least one opening which is closed with a gas-tight film cover, the film cover being supported over at least a large part of its free area by a support device which can be destroyed or retracted in a targeted manner after activation. Such a mechanism is already known from DE 195 40 618 A, in which the gas-tight film seal is opened as soon as the support device has been moved away after actuation of the device.
Um sicherzustellen, daß die gasdichte Folienabdeckung nach Wegbewegen der Abstützeinrichtung wirklich aufbricht, ist es beispielsweise in der WO 96 41 732 beschrieben worden, die Folie an einer Stelle zwangsweise über eine an der gleitend gelagerten Abstützvorrichtung vorgesehene scharfe Kante aufzuschneiden.In order to ensure that the gas-tight film cover really breaks open after the support device has been moved away, it is described, for example, in WO 96 41 732 has been described to forcibly cut the film at one point via a sharp edge provided on the slidably supported support device.
Bei Verwendung einer zerstörbaren bzw. einziehbaren oder in sich zusammenfallenden Abstützeinrichtung ist ein Aufschneiden der Abdichtfolie in Kopplung mit der Bewegung der Abstützeinrichtung selbst schwer in einer reproduzierbaren Weise zu realisieren.When using a destructible or retractable or collapsing support device, it is difficult to cut the sealing film in connection with the movement of the support device itself in a reproducible manner.
Aufgabe der Erfindung ist es daher, die gattungsgemäße Vorrichtung derart weiterzubilden, daß nach der Ansteuerung der Vorrichtung zum Einströmenlassen des unter Druck stehenden Gases sichergestellt ist, daß die gasdichte Folie, die den Druckbehälter verschließt, zwangsläufig geöffnet wird.The object of the invention is therefore to develop the generic device in such a way that after actuation of the device to allow the pressurized gas to flow in, it is ensured that the gas-tight film which closes the pressure vessel is inevitably opened.
Erfindungsgemäß wird diese Aufgabe ausgehend von einer Vorrichtung gemäß dem Oberbegriff des Patentanspruchs 1 durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Demnach weist die Vorrichtung eine Einrichtung auf, die die Folie unmittelbar nach der Ansteuerung der Vorrichtung aber noch vor dem Zeitpunkt, zu dem sich die Abstützeinrichtung bewegt, durchstößt. Hierdurch ist auch für den Fall, daß eine nach Zündung in sich zusammenfallende Abstützeinrichtung verwendet wird, sichergestellt, daß die Abdichtfolie zwangsweise geöffnet wird.According to the invention, this object is achieved on the basis of a device according to the preamble of patent claim 1 by the characterizing features of patent claim 1. Accordingly, the device has a device which pierces the film immediately after the device is actuated, but before the time at which the support device moves. This also ensures that in the event that a collapsing support device after ignition is used, it is ensured that the sealing film is forcibly opened.
Besonders geeignete Ausgestaltungen der Erfindung ergeben sich aus den aus den sich an den Hauptanspruch anschließenden Unteransprüchen.Particularly suitable refinements of the invention result from the subclaims following the main claim.
Vorteilhaft weist die Vorrichtung einen pyrotechnischen Treibsatz auf, der nach Ansteuerung gezündet wird. Dabei ist es besonders vorteilhaft, wenn der pyrotechni- sche Treibsatz nach seiner Zündung zunächst ein Durchstoßen der gasdichten Folie bewirkt und anschließend von der Abstützvorrichtung wegbewegt. Die Abstützvorrichtung weist vorteilhaft unterhalb der durch die abgestützte gasdichten Folie eine Öffnung auf, die ungefähr 20 % der Fläche der gesamten gasdichten Folie beträgt.The device advantageously has a pyrotechnic propellant charge which is ignited after activation. It is particularly advantageous if the pyrotechnic propellant first causes the gas-tight film to pierce after it has been ignited and then moves it away from the support device. The support device advantageously has an opening below the gas-tight film supported by it, which is approximately 20% of the area of the entire gas-tight film.
Durch diese Öffnung kann über das sich ausbreitende Verbrennungsgas des pyrotechnischen Treibsatzes ein Nagel angetrieben werden, um die Folie zwangsweise zu durchstoßen. Dabei kann der Nagel vorteilhaft schwenkbar an die Abstützvorrichtung angelenkt sein.A nail can be driven through this opening via the expanding combustion gas of the pyrotechnic propellant in order to forcibly pierce the film. The nail can advantageously be pivoted to the support device.
Alternativ dazu kann aber auch die Folie durch das sich ausbreitende Verbrennungsgas des pyrotechnischen Treibsatzes, das durch die Öffnung in der Abstützvorrichtung unmittelbar an die gasdichte Folie gelangt, verbrannt werden.Alternatively, however, the film can also be burned by the expanding combustion gas of the pyrotechnic propellant charge, which reaches the gas-tight film directly through the opening in the support device.
Nach einer vorteilhaften Ausgestaltung der Erfindung ist die Abstützeinrichtung derart ausgebildet, daß sie nach Zündung des pyrotechnischen Treibsatzes in sich zusammenfällt.According to an advantageous embodiment of the invention, the support device is designed such that it collapses after the pyrotechnic propellant has been ignited.
Weitere Einzelheiten und Vorteile der Erfindung werden anhand von Ausführungsbeispielen näher erläutert. Es zeigen:Further details and advantages of the invention are explained in more detail by means of exemplary embodiments. Show it:
Fig. 1 : Einen Längsschnitt durch eine erfindungsgemäße Vorrichtung nach einer ersten Ausführungsform,1 shows a longitudinal section through a device according to the invention according to a first embodiment,
die Fig. 2 bis 5: Details der Darstellung gemäß Fig. 1 zu unterschiedlichen Zeitpunkten der2 to 5: Details of the representation of FIG. 1 at different times of the
Zündung der Vorrichtung nach der ersten Ausführungsform,Ignition of the device according to the first embodiment,
Fig. 6: eine zweite Ausführungsform der Erfindung in einer Darstellung gemäß Fig. 1 und6: a second embodiment of the invention in a representation according to FIGS. 1 and
die Fig. 7 bis 9: Detaildarstellungen der Ausführungsform gemäß Fig. 6 zu unterschiedlichen Zeitpunkten während der Zündung der Vorrichtung.7 to 9: Detailed representations of the embodiment according to FIG. 6 at different times during the ignition of the device.
In der Ausführungsform gemäß Fig. 1 ist eine Vorrichtung zum Einströmenlassen von unter Druck stehendem Gas in einen hier nicht näher dargestellten Airbag gezeigt. An ein Gehäuse 12 ist ein Druckbehälter 14 zur Aufnahme eines komprimierbaren Gases angeschweißt. Das komprimierbare Gas weist beispielsweise einen Druck von 200 bar auf. Im unteren Teil des Gehäuses 12 ist ein pyrotechnischer Treibsatz 16 angeordnet, der in bekannter Art und Weise nach Ansteuerung durch einen entsprechenden Sensor zündbar ist. Der Druckbehälter 14 weist zum Gehäuse 12 hin eine Öffnung 18 auf. Diese ist in beispielsweise aus der DE 195 40 618 A1 bekannten Art und Weise mittels einer gasdichten Folie 20 verschlossen. Damit die gasdichte Folie nicht aufgrund des hohen Drucks des im Gasbehälter 14 komprimierten Gases zerstört wird, wird sie über eine zerstörbare bzw. einziehbare Abstützeinrichtung 22 abgestützt. Im Gehäuse 12 sind weiterhin in aus dem Stand der Technik bekannte Art und Weise Auslaßöffnungen 24 und vor diesen angeordnete Netze 26 vorgesehen. Durch die Auslaßöffnungen 24 kann das komprimierte Gas zum Aufblasen des Airbags strömen.In the embodiment according to FIG. 1, a device for allowing gas under pressure to flow into an airbag, not shown here, is shown. A pressure vessel 14 for receiving a compressible gas is welded to a housing 12. The compressible gas has a pressure of 200 bar, for example. A pyrotechnic propellant charge 16 is arranged in the lower part of the housing 12 and can be ignited in a known manner after activation by a corresponding sensor. The pressure vessel 14 has an opening 18 towards the housing 12. This is closed in a manner known for example from DE 195 40 618 A1 by means of a gas-tight film 20. So that the gas-tight film is not destroyed due to the high pressure of the gas compressed in the gas container 14, it is supported by a destructible or retractable support device 22. Outlet openings 24 and nets 26 arranged in front of them are also provided in the housing 12 in a manner known from the prior art. The compressed gas for inflating the airbag can flow through the outlet openings 24.
In diesem erfindungsgemäßen Ausführungsbeispiel ist an der zerstörbaren bzw. einziehbaren Abstützeinrichtung 22, die ansonsten derjenigen aus der DE 195 40 618 A1 entspricht, eine Öffnung 28 vorgesehen. Diese Öffnung 28 liegt unterhalb der von der Abstützeinrichtung 22 flächig abgedeckten und abgestützten gasdichten Folie 20. Um hier ein ungewolltes Zerstören der Folie zu verhindern, ist die Fläche des durch die Öffnung 28 geschaffenen nicht abgestützten Bereichs der Folie 20 wesentlich kleiner als die Gesamtfläche der gasdichten Folie 20 insgesamt.In this exemplary embodiment according to the invention, an opening 28 is provided on the destructible or retractable support device 22, which otherwise corresponds to that from DE 195 40 618 A1. This opening 28 lies below the gas-tight film 20, which is covered and supported by the support device 22 in order to prevent unwanted destruction of the film, the area of the unsupported area of the film 20 created by the opening 28 is significantly smaller than the total area of the gas-tight film Slide 20 in total.
Unterhalb der Öffnung 28 und der an dieser anliegenden Folie 20 ist schwenkbar an der Abstützung 22 ein Nagel 30 angeordnet. Dieser ist beispielsweise auf einem kleinen Plättchen 32 angeordnet, das an einer Kante beispielsweise über ein Filmscharnier mit der Abstützeinrichtung 22 verbunden ist, so daß sie eine Schwenkbewegung ausführen kann. Um ein durch Erschütterungen verursachtes ungewoll- tes Eindringen des Nagels 30 durch die Öffnung 28 in die über die Öffnung 28 angeordnete gasdichte Folie 20 zu verhindern, ist an dem den Nagel 30 tragenden Plättchen 32 zusätzlich eine wegbrechbare Begrenzungskante 34 angeordnet, die das Plättchen 32 in der in Fig. 1 dargestellten schrägen Lage fixiert.A nail 30 is pivotably arranged on the support 22 below the opening 28 and the film 20 resting thereon. This is arranged, for example, on a small plate 32 which is connected at one edge to the support device 22, for example via a film hinge, so that it can perform a pivoting movement. In order to avoid an unwanted To prevent penetration of the nail 30 through the opening 28 into the gas-tight film 20 arranged via the opening 28, a breakable limiting edge 34 is additionally arranged on the plate 32 carrying the nail 30, which delimits the plate 32 in the inclined position shown in FIG. 1 Fixed location.
Anhand der Fig. 2 bis 5 kann die Wirkungsweise der erfindungsgemäßen Vorrichtung erläutert werden. In der Fig. 2 ist der Zustand der Vorrichtung zum Auslösezeitpunkt dargestellt. Der Nagel 30 befindet sich noch in seiner Ausgangsposition. Es wird jedoch der pyrotechnische Treibsatz 16 gezündet, so daß das sich spontane Entwickeln des Verbrennungsgases des Treibsatzes durch eine entsprechend vorgesehene Öffnung 36 in Richtung zu dem Plättchen 32 ausströmt. Durch den sich entwickelnden Druck wird die wegbrechbare Begrenzungskante 34 weggebrochen, so daß aufgrund des sich entwickelnden Gasdrucks das Plättchen 32 um seine Schwenkkante verschwenkt wird und der Nagel 30 durch die Öffnung 28 und die gasdichte Folie 20 durchtritt, so daß die gasdichte Folie 20 sicher durchstoßen wird. Dieser Zustand ist in Fig. 3 gezeigt. Aufgrund des sich durch die Zündung des pyrotechnischen Treibsatzes 16 weiter aufbauenden Druckes wird die Abstützeinrichtung 22 seitlich verschoben, wie dies durch die Pfeilrichtung a in Fig. 4 angezeigt ist. Schließlich fällt die Abstützeinrichtung seitlich in sich zusammen und gibt die Öffnung 18 vollständig frei, so daß die zwangsweise durchstoßene gasdichte Folie 20 aufgrund der fehlenden Abstützkraft vollständig aus der Öffnung 18 durch das ausströmende Gas herausbewegt wird. Dieser Endzustand ist in Fig. 5 gezeigt.The mode of operation of the device according to the invention can be explained with reference to FIGS. 2 to 5. 2 shows the state of the device at the time of triggering. The nail 30 is still in its starting position. However, the pyrotechnic propellant 16 is ignited so that the spontaneous evolution of the combustion gas of the propellant flows out through a correspondingly provided opening 36 in the direction of the plate 32. Due to the developing pressure, the breakable boundary edge 34 is broken away, so that due to the developing gas pressure, the plate 32 is pivoted about its pivoting edge and the nail 30 passes through the opening 28 and the gas-tight film 20, so that the gas-tight film 20 surely pierces becomes. This state is shown in Fig. 3. Due to the pressure that continues to build up due to the ignition of the pyrotechnic propellant charge 16, the support device 22 is shifted laterally, as indicated by the arrow direction a in FIG. 4. Finally, the support device collapses laterally and completely opens the opening 18, so that the forcibly pierced gas-tight film 20 is completely moved out of the opening 18 by the escaping gas due to the lack of a supporting force. This final state is shown in FIG. 5.
Die Ausführungsform gemäß der Fig. 6 entspricht im wesentlichen derjenigen gemäß Fig. 1 , so daß gleiche Teile mit gleichen Bezugszeichen gekennzeichnet wurden. Im Unterschied zu der Ausführungsform gemäß Fig. 1 ist hier unterhalb der Öffnung 28 der Abstützeinrichtung 22 jedoch kein Nagel schwenkbar gelagert. Hier ist lediglich die Öffnung 28 unterhalb der gasdichten Folie 20 freigelassen. Die Wirkungsweise dieser Vorrichtung ist in den Fig. 7 bis 9 dargestellt. Die Fig. 7 entspricht der seitlichen Darstellung gemäß der Fig. 2 nach der ersten Ausführungsform der Erfindung. Hier wird der Treibsatz 16 gerade gezündet und die Verbrennungsgase treten durch die Öffnung 36 aus. Zu diesem Zeitpunkt ist die Folie 20 noch gasdicht verschlossen. In der Darstellung gemäß Fig. 8 hat sich kurz nach dem in Fig. 7 dargestellten Zeitpunkt das Gas der pyrotechnischen Treibladung ausgebreitet und ist durch die Öffnung 28 an die Oberfläche der gasdichten Folie 20 gelangt. An der Berührungsfläche hat das Gas der pyrotechnischen Treibladung die Folie verbrannt, so daß diese aufgrund des Verbrennens im Bereich der Öffnung 28 durchstoßen worden ist.The embodiment according to FIG. 6 corresponds essentially to that according to FIG. 1, so that the same parts have been identified with the same reference numerals. In contrast to the embodiment according to FIG. 1, however, no nail is pivotably mounted below the opening 28 of the support device 22. Only the opening 28 below the gas-tight film 20 is left open here. The operation of this device is shown in FIGS. 7 to 9. FIG. 7 corresponds to the side view according to FIG. 2 according to the first embodiment of the invention. Here the propellant 16 is just ignited and the combustion gases exit through the opening 36. At this time, the film is 20 still sealed gastight. 8, shortly after the time shown in FIG. 7, the gas of the pyrotechnic propellant has spread and has reached the surface of the gas-tight film 20 through the opening 28. The gas of the pyrotechnic propellant charge burned the film at the contact surface, so that it was pierced due to the burning in the area of the opening 28.
In der Darstellung gemäß Fig. 9 ist zu einem wiederum kurz darauffolgenden Zeitpunkt aufgrund des sich aufbauenden Druckes nach Zündung des pyrotechnischen Treibsatzes die Abstützeinrichtung 22 zur Seite verschoben worden, so daß sie aufgrund der fehlenden Abstützung in sich zusammenfiel. Dadurch ist die Öffnung 18 freigegeben worden und die zwangsweise geöffnete gasdichte Folie 20 ist vollständig vom Gas aus der Öffnung herausgeblasen worden. Das unter Druck stehende Gas kann somit frei aus den Öffnungen 24 in den hier nicht näher dargestellten Airbag ausströmen. In the illustration according to FIG. 9, the support device 22 has been moved to the side at a time shortly thereafter due to the pressure building up after ignition of the pyrotechnic propellant charge, so that it collapsed due to the lack of support. As a result, the opening 18 has been opened and the gas-tight film 20 which has been forcibly opened has been completely blown out of the opening by the gas. The pressurized gas can thus flow freely out of the openings 24 into the airbag, not shown here.

Claims

Vorrichtung zum Einströmenlassen von unter Druck stehendem Gas in eineSicherheitsvorrichtungPatentansprüche Device for allowing gas under pressure to flow into a safety device
1. Vorrichtung zum Einströmenlassen von unter Druck stehendem Gas in eine Sicherheitsvorrichtung, wie beispielsweise einen Airbag oder einen Gurtstrammer, mit einem Druckbehälter für komprimierbares Gas mit mindestens einer Öffnung, die mit einer gasdichten Folienabdeckung verschlossen ist, wobei die Folienabdeckung über zumindest einen Großteil ihrer freien Fläche flächig durch eine gezielt nach Ansteuerung zerstörbarer oder einziehbarer Abstützeinrichtung abgestützt ist,1. Apparatus for inflowing gas under pressure into a safety device, such as an airbag or a belt tensioner, with a pressure container for compressible gas with at least one opening which is closed with a gas-tight film cover, the film cover covering at least a large part of its free Area is supported by a support device that can be destroyed or retracted after activation,
gekennzeichnet durchmarked by
eine Einrichtung, die die Folie unmittelbar nach der Ansteuerung der Vorrichtung aber noch vor dem Zeitpunkt, zu dem sich die Abstützeinrichtung bewegt, durchstößt bzw. durchdringt.a device which pierces or penetrates the film immediately after the control of the device but before the time at which the support device moves.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß sie durch einen pyrotechnischen Treibsatz aktivierbar ist. 2. Device according to claim 1, characterized in that it can be activated by a pyrotechnic propellant.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der pyrotechni- sche Treibsatz zunächst die Durchdringung der Folie bewirkt und anschließend die Abstützeinrichtung aus ihrer Lage wegbewegt.3. Apparatus according to claim 2, characterized in that the pyrotechnic propellant first causes penetration of the film and then moves the support device away from its position.
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Ab- stütz- einrichtung unterhalb der Folienoberfläche eine Öffnung aufweist, deren Fläche kleiner ist als 20 % der gesamten Folienfläche.4. Apparatus according to claim 2 or 3, characterized in that the supporting device has an opening below the film surface, the area of which is smaller than 20% of the total film area.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß durch das Verbrennungsgas des pyrotechnischen Treibsatzes ein Nagel derart durch die Öffnung in der Abstützeinrichtung getrieben wird, daß er die Folie durchstößt.5. The device according to claim 4, characterized in that a nail is driven by the combustion gas of the pyrotechnic propellant through the opening in the support device such that it pierces the film.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Nagel schwenkbar an der Abstützeinrichtung angelenkt ist.6. The device according to claim 5, characterized in that the nail is pivotally articulated on the support device.
7. Vorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das Verbrennungsgas des pyrotechnischen Treibsatzes die Folie dadurch durchstößt, daß es ein Loch im Bereich der Öffnung der Abstützeinrichtung hineinbrennt.7. Device according to one of claims 2 to 4, characterized in that the combustion gas of the pyrotechnic propellant penetrates the film in that it burns a hole in the region of the opening of the support device.
8. Vorrichtung nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die Abstützeinrichtung so ausgestaltet ist, daß sie nach Zündung des pyrotechnischen Zündsatzes in sich zusammenfällt. 8. Device according to one of claims 2 to 7, characterized in that the support device is designed such that it coincides after ignition of the pyrotechnic primer.
PCT/EP1998/005153 1997-08-13 1998-08-13 Device for letting pressurised gas stream into a safety device WO1999008906A1 (en)

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US09/485,569 US6237951B1 (en) 1997-08-13 1998-08-13 Device for letting pressurized gas stream into a safety device
DE19881140T DE19881140B4 (en) 1997-08-13 1998-08-13 Device for injecting pressurized gas into a safety device

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DE29714518.5 1997-08-13
DE29714518U DE29714518U1 (en) 1997-08-13 1997-08-13 Device for allowing gas under pressure to flow into a safety device

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WO1999008906A9 WO1999008906A9 (en) 1999-05-14

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Also Published As

Publication number Publication date
WO1999008906A9 (en) 1999-05-14
DE29714518U1 (en) 1997-10-09
US6237951B1 (en) 2001-05-29
DE19881140B4 (en) 2007-07-19
DE19881140D2 (en) 2000-11-16

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